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Poslao: 23 Dec 2019 18:05
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- djox
- Legendarni građanin
- Pridružio: 23 Nov 2010
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Jubilej...
Citat:The Lockheed SR-71 Blackbird flew for the first time on Dec. 22, 1964 at Air Force Plant 42 in Palmdale, California. The first aircraft to enter service was delivered to the 4200th (later, 9th) Strategic Reconnaissance Wing at Beale Air Force Base, California, in January 1966. Throughout its career, that came to an end on Oct. 9, 1999, no SR-71 was reportedly lost nor damaged due to hostile actions: the SR-71 flew above Mach 3 at 85,000 feet, with a reported top speed of Mach 3.4 during flight testing and Mact 3.5 during on an operational sortie while evading a missile over Libya.
 https://theaviationist.com/2019/12/22/on-this-day-.....irst-time/
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Poslao: 12 Feb 2020 22:13
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- zoran MKD
- Legendarni građanin
- Pridružio: 21 Jan 2010
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- Gde živiš: Makedonija
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Skywhaler ::
Bash poshtujesh ove letelice .
Fakt je d aima i zashto .
Ramjet motori , sredstva za REB...
zaista ispred svog vremena.
Bogzna kolko su se Soveti muchili da ga obore !!!
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Poslao: 26 Mar 2020 16:25
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- Toni
- SuperModerator
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Kako je smanjivan radarski odraz i rad na "plazma steltu" https://www.thedrive.com/the-war-zone/32722/cias-p.....rom-radars
Citat:The A-12's engine nacelles and ducts also had chines on the outer edges and chined leading edges of the wings with saw-tooth-shaped baffles underneath the surface to further reduce the aircraft's radar returns. Curved wing extensions on the leading edges and canted rear vertical stabilizers, as well as spiked cones covering the inlets for the two huge Pratt and Whitney J58 engines, also helped deflect incoming radar waves.
Lockheed made good use of radar-absorbing composite materials in all of these areas, except for the spikes over the engine inlets. Literally on top of all of that was a layer of "iron paint," also referred to as "iron ball paint" because of the small iron balls mixed in, which also helped reduce the aircraft's radar signature. That paint's special blend, which Lockheed also used on the later SR-71, reportedly cost $400 per quart in the 1960s.
In spite of all of this, the CIA's fears about the potential vulnerability of manned reconnaissance aircraft persisted. The infamous Soviet shootdown of Gary Powers' U-2 on May 1, 1960, further fuel those concerns and ended spy plane flights over that country.
The introduction of new Soviet radars, particularly the P-14 Tall King, was also a major driving factor. The CIA, together with other U.S. Intelligence agencies and elements of the U.S. military, expended considerable effort in the 1950s and in the early 1960s, as the A-12 was still in development, gathering details about these radars through programs codenamed Melody and Palladium. Palladium involved a particularly complicated set of ruses to produce false radar returns and then observe the response from examples of these radars positioned in Cuba, allowing analysts to try to work out what radar operators were and weren't seeing on their screens, and thus how the A-12's own radar cross-section would fare against those sensors.
"In April 1963 we were directed to rebuild the aircraft chines to change the optimum radar cross-section at S-band to favor better performance against the 'Tall King,'" Johnson wrote in his 1968 history. "This was an expensive and (as it finally turned out to be) undesirable change."
Work on the cesium fuel additive, eventually known as A-50, offered one possible method of reducing the radar cross-section of the rear aspect of the aircraft. This was already a problematic area in the radar-evading work because of the jet's massive exhausts and the radar reflective plume from the J58s at full afterburner while flying at above Mach 3.
At its most basic, the general concept of plasma stealth involves using some means to create a cloud of ionized particles, or plasma, which is capable of absorbs electromagnetic radiation, such as radar waves, so they can't reflect back. Burning cesium in the super-heated exhaust stream would do just that at the back of the plane.
The obvious problem was that the exhaust stream only pointed rearward. A-50 could not produce a similar ionized cloud toward the front aspect of the aircraft, which would be most exposed as the aircraft approached the target area at the beginning of its reconnaissance pass. This is also when the aircraft would be most vulnerable.
One option the CIA considered, codenamed Emerald, was to install devices elsewhere in the aircraft that would create "a seeded plasma electric arc," similar to the effect of adding cesium in the exhaust stream, but in other directions. Another idea, codenamed Kempster, was to install electron guns that would emit electrically-charged particles to produce a similar effect.
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